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北秦岭二郎坪群晚中生代伸展-走滑-收缩体制研究

张宏远 王宗起 刘俊来 闫全人 王涛 闫瑧

张宏远, 王宗起, 刘俊来, 等, 2009. 北秦岭二郎坪群晚中生代伸展-走滑-收缩体制研究. 地质力学学报, 15 (1): 56-68.
引用本文: 张宏远, 王宗起, 刘俊来, 等, 2009. 北秦岭二郎坪群晚中生代伸展-走滑-收缩体制研究. 地质力学学报, 15 (1): 56-68.
ZHANG Hong-yuan, WANG Zong-qi, LIU Jun-lai, et al., 2009. THE LATE MESOZOIC EXTENSION-SLIPPING-CONTRACTION OF THE ERLANGPING GROUP IN THE NORTH QINLING TECTONIC BELT, CENTRAL CHINA. Journal of Geomechanics, 15 (1): 56-68.
Citation: ZHANG Hong-yuan, WANG Zong-qi, LIU Jun-lai, et al., 2009. THE LATE MESOZOIC EXTENSION-SLIPPING-CONTRACTION OF THE ERLANGPING GROUP IN THE NORTH QINLING TECTONIC BELT, CENTRAL CHINA. Journal of Geomechanics, 15 (1): 56-68.

北秦岭二郎坪群晚中生代伸展-走滑-收缩体制研究

基金项目: 

地质过程与矿产资源国家重点实验室基金项目 GPMR200634

国家自然科学基金项目 40602026

国家自然科学重点基金项目 90814006

详细信息
    作者简介:

    张宏远(1977-), 男, 河北省新城县(今高碑店市)人, 博士, 现任中国地质大学(北京)讲师, 主要从事构造地质学领域的教学科研工作。E-mail:zhanghongyuan@cugb.edu.cn

  • 中图分类号: P54

THE LATE MESOZOIC EXTENSION-SLIPPING-CONTRACTION OF THE ERLANGPING GROUP IN THE NORTH QINLING TECTONIC BELT, CENTRAL CHINA

  • 摘要: 晚中生代, 中朝、扬子两地块的拼合带进一步受到强烈的陆内构造-岩浆活动改造, 为揭示其规律性, 以拼合带上北秦岭二郎坪群主体地块为研究对象, 综合开展了中小构造解析、显微构造岩组学、电子探针、年代学等研究。研究发现, 二郎坪群主体内部的小寨-二郎坪剪切带具右行韧性走滑特征, 大庙-湾潭剪切带具右行韧性走滑兼后期脆-韧性逆掩叠加的特征; 40Ar/39Ar构造-热年代学分析揭示出一期连续抬升-剥露过程, 时间介于~ 121 Ma和~ 100 Ma之间。晚中生代二郎坪群地块经历了伸展-走滑-收缩背景依次控制下的构造改造过程, 先是在区域伸展体制下, 被内部的小寨-二郎坪剪切带、大庙-湾潭剪切带切割为抱树坪岩片、火神庙岩片、二进沟岩片等构造岩片; 在其后的早白垩世早期区域走滑背景下, 各构造岩片又发生了平移为主的右行走滑运动; 最后, 二郎坪岩体的侵入终止了内部小寨-二郎坪剪切带的活动, 而大庙-湾潭剪切带也在区域收缩体制下终止活动, 从而使二郎坪群重又焊接为一体。研究结果预示着北秦岭二郎坪群晚中生代同时期的构造体制可能与大别山是相反的。

     

  • 图  1  北秦岭二郎坪群构造简图及观测点位(据文献[12, 21-24]编制)

    A.研究区位置; B.研究区构造简图; C.二郎坪-湾潭一带地质简图; D.小水-后湾一带地质简图

    Figure  1.  A sketch showing the structure of the "Erlangping Group" in North Qinling and research positions

    图  2  中坪南二云母片岩显微构造

    强烈叶理化改造, 发育云母C-C'劈理构造, 即发育两期云母, 早期为黑云母C面理, 晚期为白云母(绢云母)C'面理。薄片号Q0414a (图 1D, 点0414), 薄片恢复产状为北西-南东走向、直立倾角; CPL—正交偏光, PPL—单偏光。下同

    Figure  2.  Micro-structure of muscovite-biotite schist from Zhongping village

    图  3  小寨-二郎坪韧性剪切带内糜棱岩三维显微构造模型

    同一糜棱岩样品(图 1D, 点0414), 薄片Q0414-1a、Q0414-1b模型由两张恢复产状的互相垂直薄片的正交偏光显微照片拼合而成, 表现出伸展型C-C'构造的发育特点, C'内常见新生矿物白云母, 指示遭受了沿主剪切面C的右行平移剪切

    Figure  3.  3D micro-structural model for mylonite from the Xiaozhai-Erlangping Ductile Shear Zone

    图  4  大庙-湾潭剪切带的显微右行剪切运动学标志

    千糜岩样品Q0403-1 (图 1C, 湾潭附近采样点0403)正交偏光照片, 显示了C-C'构造指示右行剪切的特点

    Figure  4.  Micro-dextral shearing marks along the Damiao-Wantan Shear Zone

    图  5  朱阳关-夏馆韧性剪切带小水-马蹄湾一带的糜棱岩显微岩组学分析

    眼球状长英质糜棱岩样品Q0421-7 (图 1D点0421)正交偏光照片。眼球状长石残斑较多, 波状消光, 与细粒化长石基质构成残斑系。石英主要以聚晶条带样式呈现, 其中细小单晶又多表现为细晶弱变形状态。下半球等面积投影石英c轴组构极密类型为较大的Ⅲ型极密(菱面滑移)和较小的Ⅷ型极密(底面滑移)。结合显微鉴定及产状恢复, 可判断出两个明显的韧性变形阶段:一为大极密所指示的大规模上盘指向北西的中温下降改造, 二为小极密所指示的局部性上盘指向南东的低温抬升改造过程

    Figure  5.  Micro-texture analysis of mylonite from Xiaoshui-Matiwan area along the Zhuyangguan-Xiaguan Shear Zone

    图  6  朱阳关-夏馆剪切带子母沟糜棱岩显微构造分析

    糜棱岩样品Q4124 (图 1B点4124)正交偏光显微照片。石英呈聚晶条带状, 单晶已定向拉长。下半球等面积投影石英c轴组构图显示极密类型为Ⅲ型极密(中温菱面滑移)和Ⅴ型极密(高温柱面滑移)。结合显微鉴定及产状恢复, 可判断出两个明显的韧性变形阶段:一为Ⅲ型极密所指示的上盘向北的中温构造伸展, 二为Ⅴ型极密所指示的上盘向南的高温抬升缩短

    Figure  6.  Micro-texture analysis of mylonite from Zimugou located in the Zhuyangguan-Xiaguan Shear Zone

    图  7  瓦穴子-乔端剪切带(F2)糜棱岩显微构造分析

    马连一带糜棱岩显微照片(左为单偏光, 中为正交偏光, 图 1B采样点0523)显示长英质S-C糜棱岩结构, 示右行剪切。S-C夹角13°, C-C′夹角26°

    Figure  7.  Micro-structural analysis of mylonite from the Waxuezi-Qiaoduan Shear Zone

    图  8  Q0420-1黑云母40Ar/39Ar坪年龄谱(左)和等时年龄(右)

    Figure  8.  40Ar/39Ar plateau age (left)and isochron age (right)of biotite from Sample Q0420-1

    表  1  样品Q0420-1黑云母40Ar/39Ar阶段升温测年数据

    Table  1.   40Ar/39Ar aging data of biotite from Sample Q0420-1

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  • 收稿日期:  2008-11-20
  • 刊出日期:  2009-03-28

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